Abstract
The corrosion layer formation on carbon steel during hot conditioning of
primary heat transport systems of pressurised heavy-water reactors has
been characterised using ex-situ methods (gravimetry, electron
microscopy, X-ray diffractometry). In addition, the electric and
electrochemical properties of the corrosion layers have been followed
in-situ by voltammetry and electrochemical impedance spectroscopy during
exposure to simulated hot conditioning water chemistry. The corrosion
layer formed has been found to be a bilayer oxide of the inverse spinel
type. The impedance data have been quantitatively interpreted using the
Mixed-Conduction Model for oxide films allowing for the estimation of
certain kinetic parameters at the compact layer/electrolyte interface.
The obtained results point out to the fact that the electric and
electrochemical properties of the carbon steel are determined by the
processes in a thin n-type semiconductor layer and at its interface with the electrolyte.
Original language | English |
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Pages (from-to) | 1146-1156 |
Number of pages | 11 |
Journal | Corrosion Science |
Volume | 51 |
Issue number | 5 |
DOIs | |
Publication status | Published - 2009 |
MoE publication type | A1 Journal article-refereed |